springboot整合JPA写一个登入注册页面

创建工程需要导入的部件

application.yml配置文件

spring:
  devtools:
    restart:
      enabled: false
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?serverTimezone=UTC
    hikari: # springboot 2.0 整合了hikari ,据说这是目前性能最好的java数据库连接池
      username: root
      password: 123
  jpa:
    hibernate:
      ddl-auto: update  # 第一次建表create  后面用update，要不然每次重启都会新建表
    show-sql: true

注意:如果mysql-connector-java用的6.0以上的,你的driver配置驱动是名字为com.mysql.cj.jdbc.Driver ,并且url:地址后面要加 ?serverTimezone=UTC

pom.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.xyz</groupId>
    <artifactId>springboot-jpa</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springboot-jpa</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

实体类User

package cn.xyz.springbootjpa.entity;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class User {
    @Id
    String username;
    String password;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

需要添加@Entity注解声明为实体类如果表名与实体类名字不一致需要使用@Table(name = "tbl_user")声明实体类对应的表名 @Id为主键声明

UserDao持久层

package cn.xyz.springbootjpa.dao;

import cn.xyz.springbootjpa.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;

public interface UserDao extends JpaRepository<User,Integer> {
    //查询用户通过密码和姓名
    public User getByPasswordAndUsername(String username,String password);

}

可以通过继承JpaRepository来实现对数据库的crud操作,如果需要添加对应的操作,只需写一个对应的抽象方法即可,但是方法命名有规范.

service服务层

package cn.xyz.springbootjpa.service;

import cn.xyz.springbootjpa.dao.UserDao;
import cn.xyz.springbootjpa.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl{
    @Autowired
    UserDao userDao;

    public User getUser(String username, String password) {
       return userDao.getByPasswordAndUsername(username,password);

    }

    public void insertUser(User user) {
           userDao.save(user);
    }
}

UserController 控制层

package cn.xyz.springbootjpa.controller;

import cn.xyz.springbootjpa.entity.User;
import cn.xyz.springbootjpa.service.UserServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.Map;

@Controller
public class UserController {

    @Autowired
    UserServiceImpl userServiceImpl;
    @RequestMapping("/login")
    public String login(){
        return "login";
    }

    @RequestMapping("doLogin")
    public String doLogin(User user, Map<String,Object> map){
      User user1 =  userServiceImpl.getUser(user.getPassword(),user.getUsername());
       if(user1 == null){
           map.put("msg","登入失败");
       }else{
           map.put("msg","登入成功");
       }
       return "success";
    }
    @RequestMapping("/regist")
    public String regist(){
        return "regist";
    }

    @RequestMapping("doRegist")
    public String doRegist(User user, Map<String,Object> map){
       userServiceImpl.insertUser(user);
         map.put("msg","注册成功");
        return "success";
    }
}

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登入注册页面login.html

<head>
    <meta charset="UTF-8" />
    <title>springboot登录</title>
    <style type="text/css">
        ul li{
            list-style: none;
        }
    </style>
</head>
<body>
<div >
    <form name="form" accept-charset="utf-8"  action="/doLogin">
        <ul >
            <li>
                <label  class="input-tips2">用户名：</label>
                <div class="inputOuter2">
                    <input type="text" id="username" name="username" maxlength="16" />
                </div>
            </li>
            <li>
                <label class="input-tips2">密码：</label>
                <div >
                    <input type="password" id="password"  name="password" maxlength="16"/>
                </div>
            </li>
            <li>
                <div >
                    <input type="submit" value="登录"/>
                      <a href="/regist">注册</a>
                </div>
            </li>
        </ul>
    </form>
</div>
</body>

注册页面regist.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
 <form name="form" accept-charset="utf-8"  action="/doRegist">
        <ul >
            <li>
                <label  class="input-tips2">用户名：</label>
                <div class="inputOuter2">
                    <input type="text" id="username" name="username" maxlength="16" />
                </div>
            </li>
            <li>
                <label class="input-tips2">密码：</label>
                <div >
                    <input type="password" id="password"  name="password" maxlength="16"/>
                </div>
            </li>
            <li>
                <div >
                    <input type="submit" value="确定"/>
                 
                </div>
            </li>
        </ul>
    </form>
</body>
</html>

信息页面success.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<p th:text="${msg}"></p>
</body>
</html>

注意对应的前端页面在templates中

springboot整合JPA写一个登入注册页面

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